51.
In how many different ways can the letters of the word OPERATE be arranged ?

52.
Out of 5 women and 4 men, a committee of three members is to be formed in such a way that at least one member is a women. In how many different ways can it be done ?

53.
In how many ways a committee consisting of 5 men and 6 women can be formed from 8 men and 10 women ?

54.
In how many different ways can the letters of the word GAMBLE be arranged?

55.
In how many different ways can the letters of the word RUMOUR be arranged?

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